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Patent US4394178A successfully refreshed from Google Patents.
US4394178A
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US
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Bulk lactulose/lactose separation by selective adsorption on zeolitic molecular sieves
Assignee: Katalistiks International Inc
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Filing: 1981-12-10
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Granted: 1983-07-19
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Expires: 2001-12-10
Abstract
Abstract Lactulose is selectively adsorbed from admixture with lactose using specific cationic forms (particularly barium or potassium) of modified zeolite Y.
Inventors
- 👤 Chien C. Chao
- 👤 John D. Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
C; C13; C13K; C13K13/00; C13K13/007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
A process for separating lactulose from admixture with lactose by selective adsorption which comprises contacting a mixture comprising said compounds at a temperature of from 30° C. to 100° C. and at a pressure sufficient to maintain the system in the liquid phase with an adsorbent composition comprising at least one crystalline aluminosilicate zeolite selected from a group consisting of modified zeolite Type Y having a cation site concentration of from about 40 to about 10 equivalents per mole unit cell and a face centered cubic unit cell having an a o for the decationized form of from 24.3 to 24.6 A in which the zeolitic cations are more than 50% barium or potassium, whereby lactulose is selectively adsorbed thereon; removing the nonadsorbed portion of said mixture from contact with the zeolite adsorbent; and desorbing the lactulose therefrom by contacting said adsorbent with a desorbing agent and removing the desorbed lactulose.
Claim 2
Dependent Claim
151 words
A process for separating lactulose from admixture with lactose by selective adsorption which comprises contacting a mixture comprising said compounds at a temperature of from 30° C. to 100° C. and at a pressure sufficient to maintain the system in the liquid phase with an adsorbent composition comprising at least one crystalline aluminosilicate zeolite selected from a group consisting of modified zeolite Type Y having a cation site concentration of from about 40 to about 10 equivalents per mole unit cell and a face centered cubic unit cell having an a o for the decationized form of from 24.3 to 24.6 A in which the zeolitic cations are more than 50% barium or potassium, whereby lactulose is selectively adsorbed thereon; removing the nonadsorbed portion of said mixture from contact with the zeolite adsorbent; and desorbing the lactulose therefrom by contacting said adsorbent with a desorbing agent and removing the desorbed lactulose.
Claim 3
Dependent Claim
19 words
A process in accordance with claim 1 wherein the temperature is from about 60° C. to about 80° C.
Claim 4
Dependent Claim
27 words
A process in accordance with claim 1 wherein the desorbent is selected from the group consisting of methanol, ethanol, water and mixtures of methanol, ethanol and water.
Claim 5
Dependent Claim
12 words
A process in accordance with claim 1 wherein the desorbent is water.
Claim 6
Dependent Claim
142 words
A process for separating lactulose from admixture with lactose by selective adsorption which comprises contacting a mixture comprising said compounds at a temperature of from 30° C. to 100° C. and at a pressure sufficient to maintain the system in the liquid phase with an adsorbent composition comprising at least one crystalline aluminosilicate zeolite of modified Type Y having a cation site concentration of from about 40 to about 10 equivalents per mole unit cell and a face-centered cubic unit cell having an a o for the decationized form of from 24.3 to 24.6 A in which the zeolite cations are more than 50% barium, whereby lactulose is selectively adsorbed thereon; removing the non-adsorbed portion of said mixture from contact with the zeolite adsorbent; and desorbing the lactulose therefrom by contacting said adsorbent with a desorbing agent and removing the desorbed lactulose.
Claim 7
Dependent Claim
142 words
A process for separating lactulose from admixture with lactose by selective adsorption which comprises contacting a mixture comprising said compounds at a temperature of from 30° C. to 100° C. and at a pressure sufficient to maintain the system in the liquid phase with an adsorbent composition comprising at least one crystalline aluminosilicate zeolite of modified Type Y having a cation site concentration of from about 40 to about 10 equivalents per mole unit cell and a face-centered cubic unit cell having an a o for the decationized form of from 24.3 to 24.6 A in which the zeolite cations are more than 50% barium, whereby lactulose is selectively adsorbed thereon; removing the non-adsorbed portion of said mixture from contact with the zeolite adsorbent; and desorbing the lactulose therefrom by contacting said adsorbent with a desorbing agent and removing the desorbed lactulose.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |